/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Other licenses:
 * -----------------------------------------------------------------------------
 * Commercial licenses for this work are available. These replace the above
 * ASL 2.0 and offer limited warranties, support, maintenance, and commercial
 * database integrations.
 *
 * For more information, please visit: http://www.jooq.org/licenses
 *
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 */
package org.jooq.impl;

import static org.jooq.impl.DSL.*;
import static org.jooq.impl.Keywords.*;
import static org.jooq.impl.Names.*;
import static org.jooq.impl.SQLDataType.*;
import static org.jooq.impl.Tools.BooleanDataKey.*;
import static org.jooq.SQLDialect.*;

import org.jooq.*;
import org.jooq.impl.*;

import java.util.*;

/**
 * The <code>DROP SEQUENCE IF EXISTS</code> statement.
 */
@SuppressWarnings({ "rawtypes", "unused" })
final class DropSequenceImpl
extends
    AbstractRowCountQuery
implements
    DropSequenceFinalStep
{

    private static final long serialVersionUID = 1L;

    private final Sequence<?> sequence;
    private final boolean     dropSequenceIfExists;
    

    DropSequenceImpl(
        Configuration configuration,
        Sequence sequence,
        boolean dropSequenceIfExists
    ) {
        super(configuration);

        this.sequence = sequence;
        this.dropSequenceIfExists = dropSequenceIfExists;
    }

    final Sequence<?> $sequence()             { return sequence; }
    final boolean     $dropSequenceIfExists() { return dropSequenceIfExists; }

    // -------------------------------------------------------------------------
    // XXX: QueryPart API
    // -------------------------------------------------------------------------



    private static final Clause[]        CLAUSES              = { Clause.DROP_SEQUENCE };
    private static final Set<SQLDialect> NO_SUPPORT_IF_EXISTS = SQLDialect.supportedBy(DERBY, FIREBIRD);

    private final boolean supportsIfExists(Context<?> ctx) {
        return !NO_SUPPORT_IF_EXISTS.contains(ctx.family());
    }

    @Override
    public final void accept(Context<?> ctx) {
        if (dropSequenceIfExists && !supportsIfExists(ctx)) {
            Tools.beginTryCatch(ctx, DDLStatementType.DROP_SEQUENCE);
            accept0(ctx);
            Tools.endTryCatch(ctx, DDLStatementType.DROP_SEQUENCE);
        }
        else {
            accept0(ctx);
        }
    }

    private void accept0(Context<?> ctx) {
        ctx.start(Clause.DROP_SEQUENCE_SEQUENCE)
           .visit(K_DROP)
           .sql(' ')
           .visit(ctx.family() == CUBRID ? K_SERIAL : K_SEQUENCE)
           .sql(' ');

        if (dropSequenceIfExists && supportsIfExists(ctx))
            ctx.visit(K_IF_EXISTS).sql(' ');

        switch (ctx.family()) {












            default: {
                ctx.visit(sequence);
                break;
            }
        }

        if (ctx.family() == DERBY)
            ctx.sql(' ').visit(K_RESTRICT);

        ctx.end(Clause.DROP_SEQUENCE_SEQUENCE);
    }

    @Override
    public final Clause[] clauses(Context<?> ctx) {
        return CLAUSES;
    }


}
